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. A. Cycloaddition (Diels-Alder reaction). B. Alder-ene reaction (a Miscellaneozation). C. 1,5-Sigmatropic hydrogen shift, D. [3,3]-Sigmatropic shift (Cope rearrangement). E. Cheletropic reaction. F. A 1,3-dipolar cycloaddition, a hetero-pericyclic reaction.
